Door-roller



(Model.)

H. F. SAWTELLE.

DOOR ROLLER.

No. 364,963. Patented June 14; 1887.`

@mi/kwam 514 Imailto;

UNITED STATES PATENT EEicE DOOR-ROLLER.

SPECIFICATION forming part of Letters Patent No. 364,963, dated June 14.-, 1887.

Application filed Ottober 22,1885. Serial N0.180,622. (Model.) l

To all whom, may concern.'

Beit known that I, HENRY F. SAwTELLE, a citizen of the United States, residing at Leominster, in the county of Torcester and State of Massachusetts, have invented certain new and useful Improvements in Door-Rollers, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to certain improvements in anti-friction rollers or trucks for sliding or folding doors, the object being to produce a roller on a positive antifriction principle, and one that will be inexpensive in construction.

The invention is constructed as follows, reference being had to the accompanying drawings, forming a part of this specification, in which similar letters of reference refer to similar parts wherever theyoecur on the different parts of the drawings.

Figure 1 represents aperspective view of the invention, with a portion ofthe door to which it is attached; Fig. 2, a sectional view of the roller, together with a sectional view of a portion of the door; and Fig. 3,a bottom View of the roller.

a represents the traclewhccl, and as the door is opened or closed traverses the track-1ail that is laid beside the bottom of the door. The rim of the wheel may be grooved in order to t the common lhalfround or inverted -V shaped traclerail now in general use,or may be formed in any shape, enabling it to be used with any modified track-rail that may be employed.

b indicates the axle thatis con nectcd with the track-wheel a. This axle may be made integral with the wheel. rlhe axle b projects a sufcient distance on either side of the center or hub ofthe traclewhcel a to enable the ridingrails c c to rest upon it, in order that when the irackwheel c traverses the track-rail the axle I) will traverse a circumferential proportional distance of the riding-rails c c, thus causing but a. very small amount of friction. On the axle of the track-wheel c are steadying-ilanges c The axle b is provided with a round smooth surface, Z1', projecting outwardly a vdistance cqualing the thickness ofthe smooth surface edge of the riding-rails c c, that rest directly upon it. The ends of the axle b are provided with cogs b b, that engage the cogged jections o track ff, as will be fully explained in a portion ot' this specification.

c c represent the riding-rails, one on either side and parallel with the track-wheel a, and resting on and traversed by the axle b. The ends of the riding-rails have downward proc, preventing the axle b from passing beyond its intended space. The inner portion of the lower edges of the riding-rails c c have a straight smooth surface, c c', that rests directly on the smooth surface of the axle at b b', while at the outer side is formed the cogged tracks f f, that extend the entire length of the riders. It will be noticed that the base of the cogs are on a level with the smooth portion of the ridingrails c c, and therefore the entire weight is brought to bear upon the smooth portion ofthe axle b b.

The object of the cogged track, in combination with the eogs b b,is to prevent the axle from sliding longitudinally on the rider edges should the wheel come in contact with an obstruction on the trackrail. The inner sides of the riding-rails rest lightly against the hub of the track-wheel a, or against the steadying flanges c e, thus stcadying the movements of the track-wheel a and preventing its easy derailnicnt.

d d indicate the arms that connect the inner riding-rail with the base hh. From the inner riding-rail they project upward a sufficient distance to clear the top of the track-wheel a, and then project over the track-wheel space and connect with the base It 7L, holding` theinner ridingrail rigidly in position, strengthcrr ing the base, and leaving a clear space to be traversed by the track-wheel a. It will be noticed that at the ends of the riding-rails c c there is nothing to prevent the outer portion of the track-whce1 a 'from passing ont beyond the limit of the frame-work until the axle I reaches the downward projections c c, which prevent its further passage. By this arrangement the roller is much lighter in construction, takes less space, and is much neater in design.

gg indicate the guards, designed to hold the axle b and track-wheel ain position, and should the ldoor be accidentally raised in opening or shutting, as might happen with very light doors, it would hold the traclewhecl a and axle Z2 in the position they werein When the door was raised, otherwise the wheel might slide to the lower portion of the axle-bed; or, if the door were raised sufciently,it might pass out beyond the extremities of the riding-rails, necessitating its readj ustmcnt beforeit could be used.

At the lower part of the base h 7L will be noticed the riding-rail c, constructed precisely like the outer one, that is attached to the arms d d, and in order that there may be sufficient room between it and the door to admit of the free movements of the axle b, I employ arms hh, that rest directly against and are attached to the door by means of bolts, screws, Ste.

Having thus fully described the nature, operation, and general construction of my invention, I Wish to secure by Letters Patent and clainiA In a door-roller, the riding-rails e e, provided With a smooth surface edge7 c c', con- 2o tiguous to and parallel with the longitudinal cogged track f f, in combination with the aXle b,provided with the annular plain smooth portion b b and the cogs b 1 1, as and for the v tember, A. D. 1885.

rHENRY F. SAVTELLE.

Witnesses:

CHAs. E. KNAPP, .Giro B. MONEAL. 

